$\frac{dx}{dy}=-\frac{1}{y^2}$
$\int\frac{\sin\left(x\right)}{\cos^7\left(x\right)}dx$
$\frac{1+\tan^2x}{1+csc^2x}$
$3x^2+9x+6$
$67\:-\:\left(-43\right)$
$8m^3-36m^2n-54mn^2$
$\frac{dy}{dx}=\frac{1-x-y}{1+x+y}$
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